Oil burner



H; H. HARDINGE.

OIL BURNER Filed Sept. 5, M22 4 Sheets-Shea?I l Feb, @Sie H. H. HARDINGE QZZ lL BURNER Filed Spt. 5, 1922 4 Sheets-Sheet 2 'W Maf m 4 FebflO, '1931. H, H. HARDINGE v 1,792,222

OIL BURNER Filed sept- 5, 1922 4 vSheets-Shea?, 3

Feb. l0, 1931. H. H. HARINGE Y 1,792,222

OIL BURNERv Filed sept. 5, y1922 4 Sheen-sheet 4 Patented Feb. 10, 1931 UNrraD s'ra'lisz's PATENT Vol-"Flcla: i

HENRY ERARDINGE, or CHICAGO, ILLINOIS, ASSIGNoR, RYy MRSNE ASSIGNMENTS,

To HARDINGE BROTHERS, INC., or CHICAGO, ILLINOIS, ACoRPoRA'IIoN oF ILLI- NDIS OIL BURNER Application mea september 5, 1922. .serial No. 586,073.

My invention relates to improvements in oil burners,`and is particularly concerned Vwith, though not limited to improvements in that type of oil burner which comprises t means for mechanically atomizing the oil, and

mixing itwith air to form a combustible -mixture.

' The objects of my invention are:

First: To provide an oil burner comprising a burner unit which can be easily and quickly installed in the furnace to be heated. Second: To provide an oil burner comprising means, controlled by the pressure of the oil being supplied to the oil burner, for controlling the supply of gas to the pilot light.

Third: To provide an oil burner comprising means for automatically cutting oif the supply of gas to the pilot lights after a pre.

determined interval of time.

Fourth: To provide automatic ,means for interrupting or opening the circuit of the motor, if for any reason the ame produced by the burner fails to ignite upon the starting of the machine, or is extinguished.

Fifth: To provide an oil burner compris- -ing two units, one a burner unit proper adapted to be located within a furnace, and

-the'other a pump and control unit located outsidevof the furnace, the two ,units being 3o connected by suitable pipes so that the control unit can be located at a place desired.

Sixth: To provide a novel type of .valve for making it possible to supply oil to the oil burner at an exceedingly small rate; and

Finally: To provide an oil'burner comprising means for thoroughly emulsifying the fuel o-il beforeit passes to the atomizing nozzle.

The above and other objects will appear clearly as this description progresses, reference being had to the accompanying drawings,

in which p Y, AFigure 1 is avertical section .through .a furnace equipped ywith my improved 011 unit comprising means for supplying the fuel burner, showing the pumpI unit thereof in side elevation; l l Figure 2'is a plan view of the hearth forining part of the furnace, this hearth being particularly adapted tobe used in connection with my improved furnace; L

F1gure 3 is a central-longitudinal section i through the pump unit of my improved burner;

Figure 4 is a plan view partly in section, showing certain'details of construction of the pump and control unit;

Figure 5 is a vertical transversesection taken on the broken section line 5,45 of Figure 4;

Figures 6 and 7 are sectional details, respectively taken on lines 6 6 Figure 4 and 7--7 of Figure 5; and

Figure 8 is a diagrammatic view of the fuel feedsystem. v

Throughout the several views, similar reference characters` refer to similar parts, and the several sectio'nsare taken looking in the directions of the small arrows. v As indicated above, my improved oilburner in general comprises a burning unit which is located Within the furnace, and a pump' controlled unit which may be positioned at any desired point outside of the furnace, this to the burner unit, and for controllin the supply of fuel to the burner unit, an `the operation of the burner unit.

'I shall first describe the pump unitfthe .i construction of which is illustrated clearly so in Figures 1 to 3, inclusive, and which comprises a base `plate 10, which is preferablyY provided with sharpened lugs 11 which can be driven into the floor so as to preventthe base plate from slipping. A pedestal comprising the base member l2, and the u wardly extending column 13 has a cham er 14 formed in the lower side of the base member, which is vclosed by the plug l5, these two vmembers having screw4 threaded engagement 90 as shown at 16. A sleeve a, formed inte gral with the plug 15 and extending downwardly therefrom,vslidably receives the rod the Ahardened steel ball 21,. which is seatedl 18 projecting upwardly from `the knurled head19 of the adjusting screw 20. A spiral spring 19a interposed between the lower side ofthe plug 15 and the knurled head 419 provides means for yieldingly supporting the pedestal and the remaining portions of the` burner unit. The screw 20,is threaded into by means of 'screws '23. A groove .24. is cut iu the surface of the ball 421 to receive one end ofthe pin 25, which `:is secured inthe bed plate 10, and projects into thegroo-ve.

24 sov as to prevent the ball from rotating about a vertical axis when the screw 20 is adjusted to raise or lower the parts supported thereby.

Column 13 of the pedestal sprovided with a head 26, the u per surface of which is ground flat, whic contacts with a corresponding surface 27 at the lower end of the bearing yoke 28 of the electric motor 29.- -To secure the head 26 and the surface 27 lin close contact, but Yat the Sametime' to permit the head 26 and the yoke 28 to shift slightly relatively' to each other fora purvide means for. yieldingly securing the head and the yoke together, comprising a plurality otclamping bars 30. `The outer end'of eachof these bars is pivotally. mounted on a pin 31 .projecting downwardly from the yoke 28, and the inner end of each bar is ,'yieldingly held against the lower side of the li'ead 26-by means of a screw-32, which passes through the bar and into the yoke ,28, there' being a spiral compression spring 33 located between the head of eac'h screw and each clamping'bar 30.

. From the` above description, it will be clear `that the yoke 28, and consequently the motor A29, is free to adjust itself relatively to the pedestal13, and that it will be yieldingly held by the bars 30 in` any of itsadjusted positions.

`The ield frame or houslng of. the motor 29 is'provided `with an upwardly extending cylindrical bearing support 33 for receiving and supporting the anti-friction bearing 34. Another anti-friction bearing-35 is supported in the upper side ofthe crossbar of the yoke 28. These two bearings support the hollow;

shaft 35 of the rotating element 36 of the motor, which comprises v two parts, a main part secured directly to the armature 36, and a hollow spindle'. extension 'which is threaded to the main part asi-shown' at 37, and extends upwardly through the a `,ti-'friction'bearing 34. A cap 38', having the hub .is received in a suitable bore in the bottom endof the hub 40, and provides means for causing the atomizing nozzle to rotate With -the motor shaft.

Radially extending vanes or blades 42, located'on the under side of the atomizing nozzle 39, -provide means for creating a blast of' air, which is -thrown outwardly beneath the atomizing edge 39of the nozzle to mix with the oil spray thus produced to form a-combustible mixture i A grease cup 44 communicating with a duct 45 in the motor frame provides 'means for supplying lubricant to the anti-friction bearing 34.` A flat ring 46'mounted on the upper side of the cross bar'of -the yoke 28 carries the brushes47 which bear upon the commutator 48 of the motor. B this construction,

theringcanbeadjuste toproperly position the brushes'47. 4An asbestos shield49 protects the motor from; the heat of. the furnace, and at the same time provides means for preventing any fuel oil, which might drop downwardly rom the atomizing nozzle, from striking the motor and its associated parts. pose which will be referred to later, I prober 55 formed lietvv'een the base member 12 and the inner-end of the plug 15, there being a space of a few thousandths of an inch on each side of the disk 51. This construction is of very considerable importance because I have found that some oils, and particularly those containing a rather large percentage of water and other impurities, if fed directly yto the 'atomizing nozzle will not burnvsatisfactorily, nor maintain a continuous flame..

I have discovered, however, that by the use of this disk which rotates with the atomizing -nozzle a certain'amount of emulsiication or y mixing of the various ingredients oithe` oil vtakes place, which entirely eliminates these difculties.

The tube 56 rotates freely butsnuglyin the boreof the column 13, and prevents the escape 12'5 necessary to lubricate it, and the anti-fricof any'I morejuel oil along its outside than is tion bearing 3 5. The clearance between' the tube 50 and the column 13is so small as to prevent any abrasive material from working its way along the outside of' the tube and destroying the bearing surfaces. When the motor is started, the tube 50 rotates and almost instantly causes the motor frame and the pedestal to adjust themselves relatively to each other, so as to make the bore of the column 13 co-axial with the shaft of the motor so as to prevent any binding whatever between the tube 50 and the pedestal in which it rotates.

Fuel oil is supplied to the chamber 55 by the feed pipe 5 6, which communicates with the cham er 55 through the hollow boss 57 and the port 58. j

The hearth which I prefer to use with my improved oil burner comprises a plurality of sector shaped plates 60, which are stepped downwardly as shown at 61 to provide a depression 62 (see Figure l) for receiving fireclay (not shown), the upper surfaces of the plates being used for'supporting a circular row of fire bricks 63, which protect the furnace firepot. Ateach end of each plate 60 is an Projectingdownwardly from the lower side upwardly projecting flange 63. Bolts or rivets -64 may be used for securing these flanges together so as to make an annular plate which surrounds the atomizing nozzle.

` of each sectorshaped plate is a hollow'boss 6 5, which receives the upper end of the supa section of metal port-ing post 66 which is preferably made 'of ipe.v The lower end of the pipe 66 is pre erably provided with a -bed plate 67.

Mounted upon the inner edge of the ring formed by the sector shaped plates 60 is a 'hollow ring 68 which is divided by a horizontal partition 69 into upper and lower I v passageways 70 and 71. The passageway 71 is connectedwith a gas pipe 7 2 which con tinuously supplies gas to the passageway'7 1., and the upper passageway 70 is connected with a second gas pipe 73, through vwhicliizl'ie flow ofgas is controlled by a mechanismabout to be described. Projecting upwardly from the upper surface of thehollow ring 68`fareA y a plurality of cups 74, which communicate withthe upper passageway 70 through openings in the collarsi76. Each of these` collars surrounds a small tube 77, the lower end of which projects through the partition 69 and' in to the chamber 71, the tube being h eld in place by means of a suitable bushing 78. The

su l of gas to the passageway 71 is limitedsoptlhayt the flame producd by the combus tion of the gas issuing from each of the tubes 77 is entirely confined by the associated cup 74 so as to prevent it from being extinguished. My purpose in providing a plurality of pilot light tubes 77 is to insure that if oneI of the pilotlights is extinguished some of the remaining ones will remain lighted, and also to.

insure quick ignition of the oil spray upon the initial production of the spray. As will be described later on, the supply of gas to the passageway 70 isintermittent, but in sufficient quantity to produce flames which will extend vof the neck ring 8 upwardly beyond the tops of the cups 74 a sulicient distance to contact with the oil sprayprojected from the atomizing nozzle,

and cause substantially instantaneousVignition thereof.

lA flange 80 extends inwardly from the hollowring 68, and acts as a` su port for the neck ring 81, which is 'centered y thehub 82 surrounding the extended bearing 83 and'connected with the lower edge of the neck ring 8l by means of the radial arms 83. Posts 85 project upwardly from the arms 83 and support the flat air ring 86. This ring is pro.- vided at its inner edge with av downwardly extending flange 87 that coacts with the vanes 42 von the atomizing nozzle to produce a fan construction.

In "operation, when the atomizing nozzle isrotate'd the vanes 42 produce a current of air through the ring formed by the flange 87,

and between the atomizing nozzlel and. the air IAny increase in the quantity of oil being supplied to the atomizing nozzle will create amore intense flame', thus heating the air within the furnace to a higher temperature, and correspondingly increasing the natural draft through vthe furnace. This will mean that more air will flow between the neckuring l 81 and the .air ring 8 6 to assist in the combustion of the increased quantity of fuel. The regulation of the amount of air required for complete combustion of the fuel is therefore automatic. p For` supplying oil to the atomizing nozzle, I provide the electric motor 88 (see Figs.

4 and 5)]which` isv connected 'by coupling 89 with the shaft of the pump 90 which is preferably of the gear type. 'his pump receives the fuel oil through the pipe91, which is connected with any suitable supply of oil f such as tank 91B. The pump 90 discharges through a pressure regulating valve 92 which may be of' standard construction, but which is'preferably of thetype which will permit the regulation of the pressure. Preferably, this valve is adjusted to give a pressure of from 25 to 30 pounds in the discharge pipe 93, whichleads towardthe atomilzing nozzle. The excess of oil drains downwardly through the pipe 94 (see Fig. 5) and returns to the supply tank. The oil flowing throughthe pipe 93'passes through the oilcontrol valve 95 and the cut-.off valve 96 into the feed pipe 56.

The vcontrol `valve y95 comprises a body.

member 97 having a conical ,seat 98, of'about 121, which are carried-by a suitablelpedestal o taper, formed therein. Av small opening 122 projecting upwardly from the `bed plate 99 extending through one wall of the seat 98 123. A worm;124, secured to the shaft 120,

' communicates with the pipe 93 and a correintermediate the bearings 121, mes hes with sponding, but smaller, opening 100-.(p1'efa worm wheel (not shown),securedto the end erably about .025 inch diameter), passing `'ofthe shaft 102 opposite the valve 101. Thisl ,through the wall of the s eat at avpoint open d of the shaft is journaled in arbearing 125,

p0site the opening 99, communicates with likewise SuppOIted' by the pedestal 122.

the pipe 93 which leads to the cut-ofi' valve When the motor 88 is in operation, the mo- 96. The valve 101 which -is tapered to lit tion of its shaft is Communicated-to the shaft .into the conical seat 98 is mounted upon the 120 by the WO gIOOYed Pulleys ll'ld 119,

shaft 102,which passes through the stuiing and the belt 118, and the shaft 120drives the box 103 formed integrally with the body. shaft` 102 through the worm 124 and the co-` 1 member 97 and comprising .the gasket 104, acting worm wheel.

the bush 105 and the follower 106. .A spring I shall next describe the means by which I 107interposed,l between the valve and the control the supply of oil .tfo the burner and shoulder 108 formed on the body member the supply of gas to thejpilot light. The

, provides means for yieldinoly urging the valve 96 comprisesabodymember 126'having valve 101 outwardly awayro1n the valve the bore 127 extendingtherethrough. This seat.' A V yIv bore is intersected intermediate its ends-by A plug 108' closes the open end/of the the bore 128 in which is slidably mounted the valve seat and is. provided with afbore' 109,, valve129having the transverse ppening 130 through-which the push rod 110 extends'upf extending therethrough which, 1n' one' posi? wardly, the inner end of the push rod being tion of lthe valve 129 registers-with the bore y.

in engagement with the end 'of the shat`102'g .127 so as to provide a continuous passageway Anut 111 is secured to the outer end of posts for the ilow of oil through the valve. vThe- -'112 projecting from the plug 108 by means outer end of the valve 129 has a pin 131 which of screws. 113, and carries the screw 114 to slidesin a radial'slotf inthe arm 132. This the outerend of which is secured an index arm is provided with a hub 133 which is sedisk 115, l 1aving'ithe knurled hub 116.by cured to`ashat\134; gThe shaftv 134 is jour-4 means of which the screw canV be adjusted. naled at its oppositeends in bearings 135 and The inner end-'of the screw bears against 136 carriedby pedest/als137-and 138 respectively, projecting upwardly from the? bed the push rod 110. f l

From the above descrptionfit will be seen plate 123. Longitudinal movement the .that when the screw 114 is adjusted outwardshaft 134 is prevented by means of the end ly the spring 107 will force the valvel outscrews 140 and 141. Asecond'radial arm 142 wardlya corresponding 'd1stance and (that projectsfrom the shaft 134, and is secured when the screw 114 is moved inwardly the thereto.l The outer end of this arm is conv'alve will be moved toward its seat. Inthisnected by the pivot pin'144 with the upper 1 manner1 I am enabled to adjust the distance vend of a link 145, the lower end ofwhich is between-the valve and its seat, as desired. pivotallysecure'd to the upper end ofaplung- The' valve co-acts with the| small opening er 146 by means of -the pin 147 (see Fig. 5).

to control the flow of oil to the burner. Acup leather 148 secured to the lower end of It will be apparent that by moving the valve the plunger 146 by means of a washer 149 and toward .its seat the clearance between the screw 150 provides means for reventing the Valve and the adjacent edges of the opening escape'of oil outwardly'alongt eplunger146, 100 can fha made as small or as large) as dej which is slidably mounted in the cylinder 151.

sired, mmm certain limits, and thus corre- This cylinder projects downwardly through sponding y changel the flow of oil to the .f 'an opening in the .bed plate 123,` and is supatomiiirlg urner. The constant rotation of `w`ported by an, annular flange152 which` en thefshaltt f0.2-, to'which the valve is secured, gagesthe top. side of an annular boss 153 andthe Lriction of any small'particlesof projecting upwardly from the .bed plate.

I dirt or sediment which may be inthe oil, The pipe 154 which is connected Iwith the-'discauses these particles to be moved away from charge pipe 93 by the three-way union 155 the opening 100, so that there is no clogging (see Fig. 4) communicates with the. upper' or stoppage of this opening. These particles end of a passageway 156 formed in the .wall ofdirt can move to either end of the valve, 0f the Cylinder 151, so thatvwhen the' pump and can be removed from time to time by 90 places the o il in discharge pipe 93 under' removing the' plug 108 and flushing the valve pressure aportion of this oil will flow through cavity or seat. the pipe 154- and intothe lower end of the For rotating the shaft 102v I secure a Cylinder- 151,- thus causing an upward thrust y. grooved pulley 117 to thev motor shaft, and on the plunger 146. The plungerthereupon connect it by the belt 118 with a grooved pulmoves upwardly, 'andfby its connection' with ley 119 on the end of the shaft 120.V The the-shaft 134 causes the latter to rotate in a shaft 120 is journaled Ain spaced bearings direction to move the valve 139 so as to bring the opening130 into registry with the bore 127, and thus permit passage of oil through the valve 96 to theatomizing nozzle. A coil spring 142', surrounding the shaft 134 having one end anchored to the bearing 136 and tlie'other end secured ,to the arm 142, yieldingly opposes thepressure of the oil on the lower end of the plunger 146 and `te-nds to return the plunger. to the position shown 1n Figure 5. y l

A rod 157 is secured to the shaft 134 by Vmeans of a set screw 158 and carries at its4 louter end a. weight 159. T he pin 1.44` which er, thereby in the valve 129 into registry with the bore;

to the passageway 70.

The valve for controlling the supply of gas to the passageway in the hollow ring 68 comprises a body member` 161 having the chamber 162 formed therein, and albore 163 which intersects the chamber. At its outer end the bore 163 is reduced in diameter as shown at 163. l The valve comp-rises the rod 164, which reciprocates in the bore 163, and which has al portion 164 of reduced diameter sliding in thebore 163. A spring 165 interposed between the body member 161,- and a collar 166 secured'to the outer end of the valve 164, tends to-move the valve 164 outwardly so as to permit the gas to flow through the cham-v ber 162 past the reducedportion 164 of the valve. vThe gas enters the chamber 162 from any suitable source of supply through the pipe 167, and leaves the opposite end of the chamber 162 through the pipe 73, which leads Secured to the extreme outerl end of the valve 164 is an anti-friction roller 168, which contacts with the periphery of the cam 169 having the short lobe 170. When the cam 169 is positioned as shown in Figure 4, the valve 164 is held in its innermost position andthe passageway through the chamber 162 is closed, thus shuttingolt the supply of gas to the passageway 70.

The cam 169 is secured to' a ratchet wheel 171 and both are rotatably mounted upon a pin 172, which. projects upwardly from the plate 173 which in turn is supported by a post. 174, projecting upwardly from the ed plate.. 123, a nut 175 being usedfor securing the plate to the post. The ratchet wheel is mutilated by the removal of one or" two teeth, as shown at 176. A lever 177 is pivotally mounted on the plate 173 by means of a suitable pivot pin'17 8, and is oscillated by. a pitman rod179, one end of which is pivotally secured to the lever 177 intermediate itsv ends, and the other end of which is provided with an eccentric strap 180, which co-acts with an' eccentric 181 mounted on the Shaft 102,' and secured thereto by means of the set screw 182. A pawl 183 is pivotally mounted on the outer end of the lever 177 and is adapted to engage the teeth of .thel ratchet wheel 171, it being held inengagement with the teeth of this gear in the usual manner by the spring 184.

'A secondlever185 is pivota'lly,mountedy upon the plate 173, and carries a pawl '186 at.

its outer end, which is likewise adapted to cov and which isheld in contact therewith by a act with the teeth of the ratchet wheel 171,

spring 187. A link 188 connects the-extreme outer end of the valve 129 with-a' point intermediate the ends of the lever 185, so that when the shaft 134 is rocked to move the valve 129 to its open position the pawl 1 86.l will engage a tooth of the ratchet wheel 171 fand give this ratchet wheel sutlicient angular movement to bring the pawl 183 into Contact with one of its teeth. Since the pitman rod 179 is being constantly reciprocated'as soon as the ratchet wheel'171 is brought into a position where the pawl 183 can engage the teeth thereof, it will continue toengage the successive teeth of the ratchet-wheel until it has caused this wheel. to make one complete revolution, when the pawl 183 will again engage themutilated portion of this wheel and thus permit it to come to rest in the position shown in Figure 4. However, as Soon as the pawl 183 starts to rotate the ratchet wheel, the cam 169 will rotate with the ratchet wheel and almost instantaneously the lobe 170,'will;

pass from beneath the wheel 168, which will thereupon engage the dwell portion of the 1 cam 169, thus 'permitting the valve 164 to move to its open position. This means thatduring the period the cam is making almost one complete revolution, the valve 164 will be in its open position, and for this period 'of time gas is beingsupplied to the passageway 70 and outwardly through the opening 75 to form ignitingames. ATheseflames are permitted to continue for a sufficient length of time to'insure the ignition of the combustible 'mixture zle.` f

If, for any reason, .the pressure of the oil in the ldischarge pi e 93 should fail, the spring 142 causes t e shaft 134 to rotate in formed by the atomi'zin'g noz?` a direction OPPOSite to that heretofore referred to, and the plunger 146 to move downwardly in the cylinder 151. When the shaft 134 has moved suiiciently to tilt the rod 157 to a position slightly past the vertical,

the-weight '159 will then lbecome active 'to force the vplunger 146 downwardly in the cylinder 151 and to quickly close the valve 129- This' movement 0f. the Shaft 134, 'also causesth'e link l-188120- return 'the' lever 185 audits associated pawl 186 to its initial position so that when the shaft 134 is again rotated in theopposite direction the pawl 186 will bein position to again move, the ratchet wheel 171 suliiciently. t permit thev pawl 183 to 'engagethe teeth thereof.

-For the'purpose of preventing the flooding I of the furnace in the event the iiame should,

for any reason', beextinguished while the -motor is operating and not relighted by the lpilot lights, I provide means for .automatically interrupting the circuit of themotor, and'thus preventing any further discharge ofoil from the atomizing nozzle. For this purpose, Iplace an annular trough 190 below the hearth in such position that any oil discharged from the atomizing nozzle and d ropping upon the hearth will drain down the` plates 60 and olf the inner'edges thereof intothis trough. The trough'lis supported by brackets 191, extending inwardly from the posts- 66, and is provided with a` discharge lspout 192 which delivers the oil into a bucket l193 carried by one end of the lever 194. This lever is pivotally mounted at 195, upon a A bracketl 196, which is here shown as being A. slight amount of oil discharged intothe bucket 193 will cause the latter to descend and position the valve 198 so as to cut oli' the How of oil through the pipe 56. f

The valve 92 comprises the -two chambers 92a, which receive the discharge from the lpump 90, and 9 2?) which communicates with the return pipe 94 through the valve opening 92e. The valve 92d is yieldingly urgedY toward its closed` position by the spring 92e. Outward' movement of 'the valve stem 92f is limited'by the stop screw 92g, which can be adjusted to determine the extent of the outward movement of the valve, and consequently the size of the eective opening between the chambers 92a and 92?).l The motor 88 is a constant speedmotor, and the movement ofthe valve 92d is'suilicientto compensate for the slight variations in the 'discharge of the motor due to changes in speed, but the stop 92g is so positioned that it will prevent the opening of the valve 92d, suiciently to permit the entire discharge of the pump from passing through the opening 920 under the pressure at which the apparatus normally operates. Consequently, -when the flow through the pipe 93 is stopped by the closing ofthe cut-off valve in the pipe 56, the valve 92d cannot openfar enough to permit all of the oil discharged by the pump to return to the supply tank under the vnormal operating pressure. This causes the pressure of the oil in the pipe 205 which communicates with the pipe' 93 to increase. The pipe'205 'communicates with a cylinder 206, which has a supporting plate 207 that is secured to the l bed plate 123, and in which is reciprocably mounted a plunger 208. A suitable gasket 209 secured to the inner end of the plunger 208 by a screw 210 along the plunger. T e plunger is held in its innermost position by a compression spring 211, one end of which abutsag'ainst the plunger, and theotherend of which abuts against the follower 212 screwed in the outer end of the cylinder. The spring 211 surrounds the trip rod 213,. the inner end of" i which is secured to the plunger, and the outer end of which extends through the follower 212 and is beveled, as shown at 214, to provide a cam surface for co-acting with the beveled 'endlof the trip lever 215. This lever is pivoted at 216, and is yieldingly held in engagement with a pin 217 carried by the switchblade 218 to hold the switch blade-in revents leakage of oil c contact with the switch clip 219. A tension spring 220 has one end secured to the switch blade 218, andthe other end secured to one of the screws 221, which secures the plate 207 to the bed plate 123.V When the parts are in the position shown in Figure 4, the spring 20 i i is under tension. y

When the plunger 208 moves outwardly under the pressure of the oil in the cylinder 206, its beveled end 214' causes the trip lever 215 to disengage the pin 217 and permit the .tension spring 220' to operate so as to disengage the switch blade 218 from the clip 219. These two elements, that is, the-switch blade 218 and the clip 219, form a part of the motor circuit, and whenvthey aredisengaged the circuit of the motor is opened, and it comes to a stop. A handle 222,-the`o`uter`end of" which is broken away, is provided for clos- -ing the switch. fA spring 223 engages the trip lever 215 with the pin 217 when the switch is moved to its closed position.

As soon as the'motor stops, the pressure in the pipe 205 andconsequently'in the cylinder 206 decreases, and permits the plunger 208 to return to its original position-under the influence of the spring 211, so that the switch can be closed.

. Tn Figure 5, I have illustrated the bottom of the bed plate 123 as being inclined downwardly toward the right hand side. This is` for the purpose of draining the drip oil to` the right hand side 'so that it can vdrain `through the valve opening 225 into the4 chamber 226, which communicates through the opening 227 with the return pipe 94. I provide the valve 228 for closing the opening 225, this valve being mounted upon the valve' mounted in the hollow, inwardly projecting in the pipe 94. ,1.5

boss 230 formed on the screw 23 I I lVhen there is no pressure in the pipe 94, the valve 228 will be inthe open position shown in Figure 5, but iffor any reason pressure `should be developed in thepipe 94, which would tend to cause the escape of oil through the opening 227 and the valve opening 225, the pressure of this/oil upon the lower side of the valve228 will be sufficientv to close it and hold it-in its closed position as long as there continues to be any p ressure While I have described the details o-f construction of the preferred embodiment of my inventiom'it is to be clearly understood vthat my inventionisnot limited to these details, but is capable of other adaptations and modifications within the scope of the appended claims. f

Having thus described my invention, what I claim is: Y

l. An oil burner comprising a rotary atomizing nozzle, means for supplying oil to said atomizing nozzle comprising la pressure pump having a discharge conduit connected with said atomizing nozzle, a rotary measur ing valve interposed in said discharge conduit, an oil cut-off valve'interposed in lsaid pressure conduit, means for igniting the oil spray formed by said atomizmg nozzle comprising a-pilot light, a pipe for intermittently supplyinv gas to said pilot light to form an ignition ame, a gas cut-olf valve interposed in said last mentioned pipe," means for automatically opening said oil cut-olf valve when said pump is started, comprising a rocker shaft, a spring biasing said rocker shaft to the closed position of said oil cut-0d valve,.a cylinder, a plunger reciprocably mounted in said cylinder, an arm extending from said I' said oil cut-olf valve, saidiocker sli-arf b rocker shaft and connected with said plunger by a lost motion connection, the saidcylinder being connected by a pipe with said disliarge pipe intermediate said pump and saidpnieasuring valve, an arm extending. from; said rocker shaft and pivotally connecte provided with an eccentric weight toil) sitzto either the open or closed position ofisaid oil cut-off valve when said plungeris uated in a corresponding direction, meansH ing and closing said gas shut-oif v v prising a rotary cam having anl extended dwell portion corresponding to lthe open position of said oil cut-off' valve, -a'fratchet wheelfor rotating said cam, a paWl forjeilgagin said ratchet Wheel,` means .actuated by the shaft of said rotary measuring `valve for oscillating said pawl, said ratchet wheel having a mutilated portion corresponding to the position of said cam in which said gas cut-off valve is held closed, and a second pawl actuated by said rocker arm to move ratchet d'. with f ing -Wheel so as to permit said first named pawl to 'engage the teeth thereof, the dwell portion ofv said cam being so positioned relative to the mutilated portion of said ratchet Wheel that-the fuel cut-off valve will be' opened before said gas cut-off valve is opened'.

2. An oil burner comprising a'rotary atomizing nozzle, means for supplying oilto said atomizin g nozzle comprising a pressure pump having a discharge conduit connected with' said atomizing nozzle, an oil cut-off valve in terposed in said pressure conduit, means for igniting the oil spray formed by said atomizing nozzle-comprising a pilot light, a pipe for intermittently supplying gas to said pilot light to form an ignition flame, a gas cut-oif valve interposed in said last mentioned pipe,

means for automatically opening said oil cutolf valve when saidpump is started, comprising a rocker shaft, a spring biasing said rocker shaft tothe closed positions of saidl oil cut-oft' valve, a cylinder, a plunger reciprocably mounted in said cylinder, an arm extending from said rocker shaft and connected with said plunger by al lost motion connection,

the said cylinder. being connected by-a pipe with said discharge pipe, anarm extending from said'rocker shaft and pivotally connected with said oil cut-od valve, means for opening and'closing said gas shut-off valve' comprising a rotary cam having an extended dwell portion corresponding to the open position of said oil cut-off valve, a ratchet wheel for rotatingsaid cam, a pawlfor engaging said ratchet wheel, and means actuated by the shaft of said rotary measuring valve for oscillating said pawl.,

3. An oil burner system comprising a nozzle, an oil supply leading to said nozzle, a pump for deliveringol under pressure to said supply, va fuel cut-off valve in said oil supply, a pilot light for igniting the oil in the burner, a gas supply for said pilot light,

a chamber surrounding the pilot light, a'cut- .er nozzle, a fuel supply therefor, a cut-off valve in said fuel supply, a pilot light ignitpilot light, .an independent supply for def livering gas around said pilot light, a cut-olf valve in said independent gas supply, a pressure operated device for opening said fuel cut-od valve, means whereby said device also opens the Valve in the independent gas supp1 tary atomizing nozzle for delivering fuel to y. v 5. An oil burner system comprising a roof the fuel for openl ing means in the burner, a gas supply for said I said burner, a supply conduitA leading to said duit under pressure, a cut-o whereby no -oil is delivered to the nozzle until a predetermined pressure has been reached, a cylinder connected to said supply between the cut-off and the pump, a piston in said c vl.- inder and means operated by said piston for' openingvsaid cut-off valve after a predetermined time interval. l l

6. In an oil burner system, a rotary atomiz- `ing nozzle, a conduit for delivering fuel oil thereto, a pump for supplying said fuel oil under pressureele'ctrical means for controls ling the driving mechanism of said pump and said nozzle, 'a cut-ofi` valve in said` fuel-supply, a pressure cylinder connected to said fuel supply between the pump and the' cut-off -valveand means operated bythe liquidfin' 'said pressure cylinder for opening the cutl 0E valveat a predetermined time subsequent 'to the loperation of the electrical control means. A

7. A fuel burner fuel oil su ply for said nozzle, a pump for supplying fuel under pressure to said supply,

a'pilot light-for igniting the fuel delivered by the nozzle, a gas supply "therefor, an independent gas supply for elivering gas around said pilot light',"a cut-soif valve-in said independent gas supply, means responsive t'o the pressure of said fuel oil supply for opening said cut-oli' valve in the independent gassupply Vand means including a mutilated gear and a caml associatedV therewith for vclosing said gas cut-off.

' 'pump operated thereby, a .rotary atzing nozzle, a conduit for supplying'oil from said V'mg said ratchet wheel and means responsive 105 pump to said nozzle, means for ignitingthe fuel -delivered by the nozzle, la `gas supply for said means, a cut-'off valve in said gas supply, means operated by the pressure -in the fuel supply conduit for opening said cut-off valve, means'driven by-said motor for maintaining the cut-off valve open for a predetermined period, said means including a mutilated gear and a cam. I

, 9`. In cornbinatiom-an electric motor, a rotary` atomizing nozzle for a gas burner, a pump driven by said motor for supplying o1l to said-nozzle under pressure, aconduit bei tween the pump and the nozzle, a valve chamber in said conduit, va valve in said chamber,

motor, a gas supply for igniting thevfuel .in said burner,'a cut-oif valve in said gas supply,

determined timeinterval, means for closing said valve, said latter means beingoperated by the motor through a ratchet mutilated gear combination associated with a cam.

.10. A fuel oil burner system comprising 66 a rotary atomizing nozzle, a fuel oil supply comprising a nozzle,z a

'openfor apredetermined time;

8. combination, an electric' motor, 'a`

means whereby'said'valve is rotated lby said. l K

ing means inoperative and an initiating memf ber 'actuated in response 'to the starting lof means responsiveto pressure in the fuel conduit-for opening said cut-od valve after aprep for said nozzle, a ump for delivering fuel to said supplyun erpressure,` a ,motor for.. driving said pump, a valve in Said fuel supply, means'forrotating said valve by 4said motor', a cut-off valve in 'said sup ly, a ch'am- 70 -ber connected with 'said 'supply Ibetween the` cut-ofi' and the` pump, a piston in' said cham-"- ber actuated by the fluid delivered ther-*etev adapted to open the cutoff valvein the' fuel l supply conduit, a gas supply/ for gnitngthe 'f5 fuel delivered by the nozzle, a cut-oif valve in sai"c},-'gas supply, means lconnected to. the fuel c t-oif valve for vopening the gas cut-ofi` valve, andmeans operated by said motor fdr 'closing the gas cut-off valve after a time in- 80 terval suflicientfor theignition of l' the fuel delivered by the nozzle. y ,i

11.- An oil burner compri'sin an operating motor, means.- for supplying uel oil to thc burner, a cut off valve therefor, anigniting` flame' nozzle for the burner, means forsup- I plying gas thereto, a cut off valve therefor,

a timing mechanism forclosing said gas shut ofi'V valve' and means responsive incident to the' rotation of 'the motor for opening said 90 fuel cut off and for initiating the 'operation of said timing'me'ch'anis'm to open said gas cut'oif whereby said'timing' mechanism will close said gas shut olf valve after it has been "12. An oil burner comprising an operating motor, "means *foin supplying fuel oil to' the burnerg- .a cutolffvalve therefor, an igniting vflame :nozzle for-the burner, means'for sup-.

plying gas thereto', a cut off valve therefor', afloo timing mechanism for closing -said gas shut oil' valve, said mechanism comp'risinf'g a mutilated' ratchet wheel,"a driving pawl actuated by the motor, and an initiating pawl-for mov-"- incident to the rotation ofthe motor for openings'aid fuel cut olf and moving said initiating pawl to open said gas cut 0E.

13'. An oil burner 'comprising power driven means for mixing air and. oil, an electric oplio erating motor therefor, a gas li ht for ignit-4 ing the "burner, a gas feed-conduit therefor,

, a valve-in sai-d. conduit, means responsive to therotation `ofsaid motor for opening saidpw valve and means for lclosing said valve after4 'M/l a' predetermined interval of time comprising a timing wheel, advancing means engaging.

'said'wheeL and driven,by the motor for advancing s aid timing wheel, a lmutilated re-' Y glon insaidwheel for rendering said advanc-v burner, a gas feed thereto, means for controlling said gas feed comprisingvalve means, means driven by the motor and adapted when initiated to open said valve means and close the same after a predetermined time interval, and means responsive incident to the starting of the motor to initiate the means whereby the valve means is actuated. I

In Witness whereof, I hereunto subscribe my name this 27 day of June, 1922.

. HENRY H. HARDINGE 

